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DEBT - DESCRIPTION (Details)
$ in Thousands
1 Months Ended 3 Months Ended
Apr. 27, 2020
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jul. 31, 2015
USD ($)
Jan. 31, 2014
USD ($)
Aug. 31, 2004
USD ($)
Sep. 30, 2003
USD ($)
Mar. 31, 2020
USD ($)
Jun. 30, 2012
USD ($)
item
Dec. 31, 2019
Debt                    
Payment of debt financing costs               $ 3,100    
Revolving Credit Facility                    
Debt                    
Interest rate during period (as a percent)               3.50%    
Maximum borrowing capacity under revolving credit facility               $ 650,000    
Uncommitted option to increase credit facility               250,000    
Unused portion of credit facility               163,600    
Payment of debt financing costs               $ 2,000    
Revolving Credit Facility | Minimum                    
Debt                    
Ratio of consolidated EBITDA to interest expense               3.50    
Credit facility commitment fee percentage               0.25%    
Revolving Credit Facility | Minimum | London Interbank Offered Rate (LIBOR)                    
Debt                    
Variable rate margin               1.75%    
Revolving Credit Facility | Minimum | Base rate                    
Debt                    
Variable rate margin               0.75%    
Revolving Credit Facility | Maximum                    
Debt                    
Credit facility commitment fee percentage               0.55%    
Revolving Credit Facility | Maximum | London Interbank Offered Rate (LIBOR)                    
Debt                    
Variable rate margin               3.50%    
Revolving Credit Facility | Maximum | Base rate                    
Debt                    
Variable rate margin               2.50%    
Standby and commercial letters of credit                    
Debt                    
Maximum borrowing capacity under revolving credit facility               $ 100,000    
Unused portion of credit facility               $ 7,700    
Standby and commercial letters of credit | Minimum                    
Debt                    
Line of credit fees percentage               1.75%    
Standby and commercial letters of credit | Maximum                    
Debt                    
Line of credit fees percentage               3.50%    
Swing Line Loans                    
Debt                    
Maximum borrowing capacity under revolving credit facility               $ 50,000    
5.34%, payable through 2028                    
Debt                    
Interest rate (as a percent)               5.34%   5.34%
5.34%, payable through 2028 | MatNav                    
Debt                    
Debt issued             $ 55,000      
Interest rate (as a percent)             5.34%      
Semi-annual payments             $ 1,100      
5.79%, payable through 2020                    
Debt                    
Interest rate (as a percent)               5.79%   5.79%
Annual principal payments               $ 3,500    
5.27%, payable through 2029                    
Debt                    
Interest rate (as a percent)               5.27%   5.27%
5.27%, payable through 2029 | MatNav                    
Debt                    
Debt issued           $ 55,000        
Interest rate (as a percent)           5.27%        
Semi-annual payments           $ 1,100        
Senior Unsecured Long Term Debt                    
Debt                    
Debt issued         $ 100,000          
Debt instrument term         30 years          
Interest rate (as a percent)         4.35%          
Senior Unsecured Long Term Debt | Debt Instrument Redemption 2021                    
Debt                    
Annual principal payments         $ 5,000          
Senior Unsecured Long Term Debt | Debt Instrument Redemption 2022 and 2023                    
Debt                    
Annual principal payments         7,500          
Senior Unsecured Long Term Debt | Debt Instrument Redemption 2024 to 2027                    
Debt                    
Annual principal payments         10,000          
Senior Unsecured Long Term Debt | Debt Instrument Redemption 2028                    
Debt                    
Annual principal payments         8,000          
Senior Unsecured Long Term Debt | Debt Instrument Redemption 2029 and thereafter until 2044                    
Debt                    
Annual principal payments         $ 2,000          
4.35%, payable through 2044                    
Debt                    
Interest rate (as a percent)               4.35%   4.35%
Unsecured debt                    
Debt                    
Debt issued                 $ 170,000  
Number of tranches | item                 3  
Unsecured debt | Debt Instrument Redemption 2015 through 2016                    
Debt                    
Semi-annual payments                 $ 4,600  
Unsecured debt | Debt Instrument Redemption 2017 through mid-year 2023                    
Debt                    
Semi-annual payments                 8,400  
Unsecured debt | Debt Instrument Redemption Mid-year 2023 through mid-year 2027                    
Debt                    
Semi-annual payments                 3,800  
Unsecured debt | Debt Instrument Redemption After mid-year 2027                    
Debt                    
Semi-annual payments                 1,200  
Unsecured debt, tranche maturing in 2023                    
Debt                    
Debt issued                 $ 77,500  
Interest rate (as a percent)                 3.66%  
Unsecured debt, tranche maturing in 2027                    
Debt                    
Debt issued                 $ 55,000  
Interest rate (as a percent)                 4.16%  
Unsecured debt, tranche maturing in 2032                    
Debt                    
Debt issued                 $ 37,500  
Interest rate (as a percent)                 4.31%  
Notes 30 years                    
Debt                    
Debt issued       $ 75,000            
Debt instrument term       30 years            
Interest rate (as a percent)       3.92%            
Notes 30 years | Debt Instrument Redemption After 2026                    
Debt                    
Annual principal payments       $ 1,500            
Notes 30 years | Debt Instrument Redemption 2017 through 2019                    
Debt                    
Annual principal payments       1,800            
Notes 30 years | Minimum | Debt Instrument Redemption 2020 through 2026                    
Debt                    
Annual principal payments       1,300            
Notes 30 years | Maximum | Debt Instrument Redemption 2020 through 2026                    
Debt                    
Annual principal payments       $ 8,000            
Senior Unsecured Series A Notes                    
Debt                    
Debt issued   $ 75,000                
Debt instrument term   11 years                
Interest rate (as a percent)   3.37%                
Senior Unsecured Series A Notes | Debt Instrument Redemption 2021                    
Debt                    
Semi-annual payments   $ 5,800                
Senior Unsecured Series A Notes | Debt Instrument Redemption 2022 through 2027                    
Debt                    
Semi-annual payments   $ 11,500                
Title XI Notes | MatNav                    
Debt                    
Debt issued $ 185,900                  
Interest rate (as a percent) 1.22%                  
Annual principal payments $ 4,000                  
Payment of debt financing costs 8,700                  
Proceeds from issuance of debt $ 177,000                  
The Senior Unsecured Notes (The "Series D Notes")                    
Debt                    
Debt issued     $ 200,000              
Debt instrument term     15 years              
Interest rate (as a percent)     3.14%              
Maturities of Long-term Debt                    
Semi-annual principal payments in year 2019     $ 6,000              
Semi-annual principal payments in 2020 to 2023     9,200              
Semi-annual principal payments in 2024 to 2031     $ 7,150